.box1 {
    width: 100px;
    height: 100px;
    background-image: url(../images/Idea.jpg);
    background-size: cover;
}

.box2 {
    width: 100px;
    height: 100px;
    background-image: url(../images/Grip.jpg);
    background-size: cover;
}

.box3 {
    width: 100px;
    height: 100px;
    background-image: url(../images/Gradle.png);
    background-size: cover;
}